A UFO investigator says he has "no doubt" a secret alien base lies beneath the North Wales coast.

Russ Kellett, who has spent more than three decades probing the Berwyn Mountains incident in 1974, claims an ET HQ is hidden in the depths of the sea, near Llandudno.

The theorist, who claims he has been abducted by aliens a number of times in the past, believes a secret military operation took place in the Irish Sea between North Wales and Liverpool on the morning of the Berwyn Mountains incident in a bid to search for extraterrestrial life.

He believes that mission disturbed an alien species and sparked the mysterious event later that day.

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Police arrived in the area and an RAF search and rescue team was scrambled from Anglesey.

Some claim a UFO crash landed on the Berwyn Mountains (Image: UGC TNW)

Mr Kellett claims he discovered proof that a military "photoflash exercise" had in fact taken place that morning, after a friend got hold of an official document by the Maritime and Coastguard Agency (MCA).

He claimed the letter confirm an exercise took place that January morning from RAF Jurby - a former Isle of Man base - that saw "at least 80 flashes" around the Liverpool Bay area and the North Wales coastline.

It adds the coastguards were advised to expect "at least 10 aircrafts taking part" in the mission.

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Mr Kellett who says Royal Navy battleships and military planes were involved in the exercise, is convinced it was undertaken in a bid to locate the alien base where he believes their spacecrafts are built.

"North Wales is deemed a hotspot for UFOs since the Berwyn Mountains incident. I have been looking very closely over this area, and something is definitely going on," he said.

"There is no doubt there is an alien base under the sea on the North Wales coastline where they build all their crafts.

Russ Kellett believes UFOs were out there that night

"Why would the military want or need to light up the sea with 80 photoflash bombs if they weren't looking for submersible objects? I think they knew there was a base under the sea and they did it to light up the area so they knew where to attack so they could pull the saucers out.

"It just seems like too much of a coincidence that this took place on exactly the same day as the Berwyn Mountains incident.

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The UFO spotter even claims there was a "battle fleet" out that night that "hit three flying saucers".

He claims one was destroyed after being shot down when it emerged from the sea, another was shot down later that day and destroyed to pieces in the Berwyn Mountains, and the other he says managed to escape.

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Mr Kellett, who has appeared in a number of TV documentaries on the subject, added: "Witness statements from the time also say someone saw a flying saucer attack one of the battle ships in the area at the time," he added.

The red dot shows where the incident is said to have happened. Black dotted lines leading to dot from the west show the alleged path of RAF jets and UFO. Black dotted lines from the north show jet flight path

"And someone else who said his dad was working with the army on the operation said they were working on an underground facility and they they were facing a major problem - he said it was an underground alien base.

"I think the base is still there today and I think things are still going on there. North Wales it a hotspot for UFO sightings.